Department of Chemistry, Zhejiang University, Hangzhou, People's Republic of China.
Dalton Trans. 2011 Feb 21;40(7):1576-83. doi: 10.1039/c0dt01211d. Epub 2011 Jan 7.
Mono- and polynuclear complexes containing 3-(1,10-phenanthrolin-2-yl)-1-(pyridin-2-ylmethyl)imidazolylidene (L), NiL(2)(2) (2), CoL(2)(3) (3), PtLCl (4), PdAgL(2)(3) (5), PdCuL(2)(3) (6), Pd(2)L(2)Cl(2)(2) (7), and Pd(3)L(2)Cl(4)(2) (8) have been prepared and fully characterized by NMR, ESI-MS spectroscopy, and X-ray crystallography. In complexes 2-4, the ligand binds to metals in a pincer NNC fashion with the pyridine group uncoordinated. Complexes 5 and 6 are isostructural to each other in which the palladium ions are surrounded by two pyridines and two imidazolylidenes and Ag(I) or Cu(I) is coordinated by two 1,10-phenanthroline moieties. In the trinuclear palladium complex 8, one palladium ion has an identical coordination mode as in 5 and 6, and the other two palladium ions are bonded to the 1,10-phenanthroline. Complex 6 exhibits excellent catalytic activity for the tandem click/Sonogashira reaction of 1-(bromomethyl)-4-iodobenzene, NaN(3), and ethynylbenzene in which three C-N bonds and one C-C bond are formed in a single flask.
单核和多核配合物含有 3-(1,10-菲咯啉-2-基)-1-(吡啶-2-基甲基)咪唑啉基(配体 L), NiL(2)(2) (2), CoL(2)(3) (3), PtLCl (4), PdAgL(2)(3) (5), PdCuL(2)(3) (6), Pd(2)L(2)Cl(2)(2) (7), 和 Pd(3)L(2)Cl(4)(2) (8) 已经通过 NMR、ESI-MS 光谱和 X 射线晶体学进行了制备和全面表征。在配合物 2-4 中，配体以钳式 NNC 方式与金属结合，吡啶基团未配位。配合物 5 和 6 彼此结构相同，其中钯离子被两个吡啶和两个咪唑啉基包围，Ag(I)或 Cu(I)由两个 1,10-菲咯啉部分配位。在三核钯配合物 8 中，一个钯离子具有与 5 和 6 相同的配位模式，而另外两个钯离子与 1,10-菲咯啉键合。配合物 6 对 1-(溴甲基)-4-碘苯、NaN(3)和苯乙炔的串联点击/Sonogashira 反应表现出优异的催化活性，其中三个 C-N 键和一个 C-C 键在一个单瓶中形成。
